A patient has a eucapnic voluntary hyperventilation (EVH)test to evaluate bronchial hyperreactivity.If the subject's FEV₁ is 3.3 L and her FVC is 4.0 L,which of the following is the appropriate target ventilation for the test? A) 50 times the FEV₁ for 1 minute B) 30 times the FEV₁ for 6 minutes C) 2 times the FVC for 6 minutes D) Cannot be determined without the MVV

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Quizplus · Accepted Answer

The appropriate target ventilation for the EVH test is 30 times the FEV1 for 6 minutes. In this case, 30 times the FEV1 of 3.3L is 99L. The test should be performed for 6 minutes at this ventilation level. Option A is incorrect because it suggests only 1 minute of hyperventilation, which is not long enough for the test. Option C suggests a target ventilation based on FVC, which is not appropriate for the EVH test. Option D is incorrect because the MVV is not necessary to calculate the appropriate target ventilation for the EVH test.

A Patient Has a Eucapnic Voluntary Hyperventilation (EVH)test to Evaluate